1 //===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an MCInst --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains code to lower PPC MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
16 #include "MCTargetDesc/PPCMCExpr.h"
17 #include "llvm/ADT/SmallString.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/CodeGen/AsmPrinter.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
22 #include "llvm/IR/GlobalValue.h"
23 #include "llvm/MC/MCAsmInfo.h"
24 #include "llvm/MC/MCExpr.h"
25 #include "llvm/MC/MCInst.h"
26 #include "llvm/Target/Mangler.h"
29 static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) {
30 return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>();
34 static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO, AsmPrinter &AP){
35 MCContext &Ctx = AP.OutContext;
37 SmallString<128> Name;
39 if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB)
41 else if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG)
42 Suffix = "$non_lazy_ptr";
45 Name += AP.MAI->getPrivateGlobalPrefix();
47 unsigned PrefixLen = Name.size();
50 assert(MO.isSymbol() && "Isn't a symbol reference");
51 AP.Mang->getNameWithPrefix(Name, MO.getSymbolName());
53 const GlobalValue *GV = MO.getGlobal();
54 AP.Mang->getNameWithPrefix(Name, GV);
57 unsigned OrigLen = Name.size() - PrefixLen;
60 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
61 StringRef OrigName = StringRef(Name).substr(PrefixLen, OrigLen);
63 // If the target flags on the operand changes the name of the symbol, do that
64 // before we return the symbol.
65 if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB) {
66 MachineModuleInfoImpl::StubValueTy &StubSym =
67 getMachOMMI(AP).getFnStubEntry(Sym);
68 if (StubSym.getPointer())
73 MachineModuleInfoImpl::
74 StubValueTy(AP.getSymbol(MO.getGlobal()),
75 !MO.getGlobal()->hasInternalLinkage());
78 MachineModuleInfoImpl::
79 StubValueTy(Ctx.GetOrCreateSymbol(OrigName), false);
84 // If the symbol reference is actually to a non_lazy_ptr, not to the symbol,
85 // then add the suffix.
86 if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG) {
87 MachineModuleInfoMachO &MachO = getMachOMMI(AP);
89 MachineModuleInfoImpl::StubValueTy &StubSym =
90 (MO.getTargetFlags() & PPCII::MO_NLP_HIDDEN_FLAG) ?
91 MachO.getHiddenGVStubEntry(Sym) : MachO.getGVStubEntry(Sym);
93 if (StubSym.getPointer() == 0) {
94 assert(MO.isGlobal() && "Extern symbol not handled yet");
95 StubSym = MachineModuleInfoImpl::
96 StubValueTy(AP.getSymbol(MO.getGlobal()),
97 !MO.getGlobal()->hasInternalLinkage());
105 static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
106 AsmPrinter &Printer, bool isDarwin) {
107 MCContext &Ctx = Printer.OutContext;
108 MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
110 unsigned access = MO.getTargetFlags() & PPCII::MO_ACCESS_MASK;
113 case PPCII::MO_TPREL_LO:
114 RefKind = MCSymbolRefExpr::VK_PPC_TPREL_LO;
116 case PPCII::MO_TPREL_HA:
117 RefKind = MCSymbolRefExpr::VK_PPC_TPREL_HA;
119 case PPCII::MO_DTPREL_LO:
120 RefKind = MCSymbolRefExpr::VK_PPC_DTPREL_LO;
122 case PPCII::MO_TLSLD_LO:
123 RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO;
125 case PPCII::MO_TOC_LO:
126 RefKind = MCSymbolRefExpr::VK_PPC_TOC_LO;
129 RefKind = MCSymbolRefExpr::VK_PPC_TLS;
133 const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, RefKind, Ctx);
135 if (!MO.isJTI() && MO.getOffset())
136 Expr = MCBinaryExpr::CreateAdd(Expr,
137 MCConstantExpr::Create(MO.getOffset(), Ctx),
140 // Subtract off the PIC base if required.
141 if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) {
142 const MachineFunction *MF = MO.getParent()->getParent()->getParent();
144 const MCExpr *PB = MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), Ctx);
145 Expr = MCBinaryExpr::CreateSub(Expr, PB, Ctx);
148 // Add ha16() / lo16() markers if required.
151 Expr = PPCMCExpr::CreateLo(Expr, isDarwin, Ctx);
154 Expr = PPCMCExpr::CreateHa(Expr, isDarwin, Ctx);
158 return MCOperand::CreateExpr(Expr);
161 void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
162 AsmPrinter &AP, bool isDarwin) {
163 OutMI.setOpcode(MI->getOpcode());
165 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
166 const MachineOperand &MO = MI->getOperand(i);
169 switch (MO.getType()) {
172 llvm_unreachable("unknown operand type");
173 case MachineOperand::MO_Register:
174 assert(!MO.getSubReg() && "Subregs should be eliminated!");
175 MCOp = MCOperand::CreateReg(MO.getReg());
177 case MachineOperand::MO_Immediate:
178 MCOp = MCOperand::CreateImm(MO.getImm());
180 case MachineOperand::MO_MachineBasicBlock:
181 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
182 MO.getMBB()->getSymbol(), AP.OutContext));
184 case MachineOperand::MO_GlobalAddress:
185 case MachineOperand::MO_ExternalSymbol:
186 MCOp = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP, isDarwin);
188 case MachineOperand::MO_JumpTableIndex:
189 MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, isDarwin);
191 case MachineOperand::MO_ConstantPoolIndex:
192 MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, isDarwin);
194 case MachineOperand::MO_BlockAddress:
195 MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP,
198 case MachineOperand::MO_RegisterMask:
202 OutMI.addOperand(MCOp);